Disk-carbon holder for electric lamps



I (No Model.)

4 I E. a. RUSSELL.

y DISK CARBON HOLDER FOR ELECTRIC LAMPS.

No. 446,549. Patented Feb. 17,1891.

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EDYVIN O. RUSSELL, OF B oieK oAasoN HOLDER a'rnnii rain.

OSTON, MASSACHUSETTS.

FOR ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 446,549, dated February17, 1891.

Application filed May 14, 1890.

To aZZ whom it may concern:

Be it known that I, EDWIN CHARLES RossELL, a citizen of the UnitedStates, residing at Boston, in the county of Suffolk and State ofMassachusetts, have invented certain new and useful Improvements inDisk-Carbon Holders for Are Lamps, of which the following, taken inconnection with the accompanying drawings, is a specification.

The object of my invention is to produce a holder for disk carbons forelectric lamps upon which the carbon can be readily placed and removedtherefrom, and which will adjust itself centrally in the hole of thecarbon and hold said carbon at right angles to the axis of the holder;and the invention consists of aspindle having a screw-threadedenlargement and a conical projection and a split thimble, the inner endof which is threaded to fit the screw on the spindle, as hereinafterfully described, and pointed out in the claims.

Figure 1 represents a longitudinal section of a disk-carbon holderembodying my invention, showing a carbon thereon. Fig. 2 is a side viewof the holder, showing the thimble in the expanded position. Fig. 3isasimilar view showing the thimble in section and in the contractedposition. Figs. 4 and 5 are respectively side and front views of thethimble detached.

A represents the spindle, formed with an enlargement B, that isscrew-threaded, and also a conical enlargement O.

D is the split thimble, having a flange (Z, that is formed with ascrew-threaded hole 6, which fits onto the screw B. The thimble isdivided into sections, preferably four, as shown, each section acting asa spring, so that if they be expanded and then released they will returnto their former position.

To secure a disk carbon, as E, upon the holder, the split thimble isdrawn back, as shown in Fig. 3. The carbon is then placed upon the sameand the flange d is turned until the thimble D is in the position shownin Figs. 1 and 2--that is, until the outer ends of the split thimblehave been expanded by the conical projection C, so that its outer endsare in contact with the side of the hole in the carbon disk E, and theinner surface l of the disk pressed against the side of the flange d, sothat the disk is forced to assume a position at right angles to thespindle A, and is thus securely held.

d is a small projection or thuinb-piece, so that in case the thimbleshould stick a great leverage may be obtained by placing the thumbagainst it when removing the carbon.

In practice the holder is supported by a forked frame, the outer end aof the spindle forming one journal and the portion a at the rear of thescrew B forming the other journal, and on the inner end of the spindleis mounted a pinion F, to which a rotary motion is imparted by a rack orother suitable means.

That I claim is 1. A disk-carbon holder consisting of a spindle having ascrew-thread and a conical enlargement at the inner end and a pinion atthe outer end, in combination with a split thimble connected toascrew-threaded collar, substantially as set forth.

2. A diskcarbon holder consisting of a spindle A, having ascrew-threaded enlargement B and a conical enlargement C at its innerend and a pinion F at its outer end, in combination with a split thimbleD, the flange d of which is provided with a screw-threaded hole 6, thatfits onto the screw B, substantially as set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 2d day of May, A. D.1890.

EDWIN C. RUSSELL.

Witnesses:

CHAS. STEERE,

EDWIN PLANTA.

